1 / 17

Photo Detectors

Explore the fascinating world of photodetectors, specifically p-n photodiodes, and how they work through a reverse-biased p-n junction. Learn about the generation of photocurrent and electron-hole pairs when light interacts with the depletion region. Discover the significance of avalanche photodiodes (APD) in minimizing receiver noise.

walterj
Download Presentation

Photo Detectors

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Photo Detectors

  2. p-n Photodiodes • A reverse biased p-n junction consists of a region known as depletion region that is devoid of free charge carriers. • When light impinges on one side of such a p-n junction, electrons absorb light and make a transition from valence band to conduction band. Thus, electron-hole pair is created through light absorption. • The electrons and holes generated inside the depletion region accelerate in opposite directions due to the reverse bias. • This gives rise to a current flow in an external circuit and this current flow is known as the photocurrent.

  3. p-n photodiodes

  4. p-n photodiodes

  5. p-n photodiodes

  6. p-n photodiodes

  7. p-i-n photodiodes

  8. p-i-n photodiodes

  9. Avalanche Photodiodes (APD)

  10. Avalanche Photodiodes (APD)

  11. Receiver Noise

  12. Shot Noise

  13. Thermal Noise

  14. Thermal Noise

  15. Noise in p-i-n Receivers

  16. Noise in APD Receivers

  17. Avalanche Photodiodes (APD)

More Related